it's not that you wouldn't parachute because you could land, abseil or fastrope, it's, would it be better to parachute. parachute is fine, a HALO will start the team very close together, and i don't know what kind of kit would be to sensitive for an air drop. and jumping is definately not for when you can't use a chopper. jumping is for when you require the what the jump adds to your mission, using a chopper is for when it's the best way in that keeps with your mission, same for everything else.
you can walk in, or drive, but it's unlikely you'll walk if it's very far, and driving is a possibility, but it's hard to stay covert if that's what you plan to do.
and yes, boats are an option. a good one too, if your target is near the coast. but you'd either need to be in and out very fast, or would need to take the boat with you so as not to be ambushed when you return